We've got a system in place to ensure very few people kill each other. It would be nice if that same system could ensure people wouldn't just copy photographs (for commercial purposes). And it actually does a reasonable job of that.
This guy wasn't arguing he has a hard time making a living, which is the argument that people seem to be replying to. He's arguing that people shouldn't copy photographs for commercial purposes. It's hard to see how anyone could disagree with that: I don't want my code copied either (well, specific parts of it). The question of what you should do when people in fact do copy your photographs is mostly separated from that.
The question of what should be done in cases of copyright infringement is the only one that can really be usefully discussed, which is probably why most people are addressing that instead. Should people copy photographs for commercial purposes? Of course not. End of discussion, not much more to say.
This seems to come up fairly often - an article making a moral argument that copying is wrong, followed by comments saying "Yeah, but it still happens, so you should do X", followed by replies saying "no, but you don't understand, it's wrong!"
Strangely enough, this seems to come up mostly in the context of music (or, in this case, photography). I haven't seen many software blogs making a purely moral argument as opposed to a practical discussion of what to do about it.
This guy wasn't arguing he has a hard time making a living, which is the argument that people seem to be replying to. He's arguing that people shouldn't copy photographs for commercial purposes. It's hard to see how anyone could disagree with that: I don't want my code copied either (well, specific parts of it). The question of what you should do when people in fact do copy your photographs is mostly separated from that.